Concrete-mixing machine.



0,. G. MANDI. n

CONCRETE MIXING MACHINE. APPLICATION vFILED JAN. I8. |916.

1,1 90,927. l I v Patented July 11, 1916.

0.6. MANDT. CONCRETE Mlxmc MACHINE;

APPLICATION FILED JAN-'18. 15H6.

Patented July 11, 1916.

2 SHEETS-SHEET 2 Wl T/I/E SSE S 'Unire sa ,raten OBERT G. MANDT, 0F KEOKUK',

CONCRETE-MIXING IVIACI-IINE.

Specication of Letters Patent.

Patented July 11, 1916.

Application filed January 18, 1916. Serial No. 72,726.

T0 all whom t may concern Be it known that I, GEERT Gr. MANDT, a citizen of the United States, and a resident of Keokuk, in the county of Lee and State of Iowa, have invented a new and Improved Concrete-Mixing Machine, of which the following is a full, clear, and exact description.

This invention relates to concrete mixing machines and has for an obj ect the provision of an improved arrangement of mixing members xed to the drum whereby there will be a quick and thorough mixture of material fed into the drum.

Another object in view is to provide an improved construction and arrangement of mixing blades, each of which is formed with a guiding portion and a bucket, whereby the load is carried centrally but the material is worked back and forth.

o A still further object in view is to provide mixing blades merging into a bucket, the various buckets being arranged centrally of the drum and formed so as to all discharge as occasion may demand.

In the accompanying drawings: Figure 1 is a longitudinal vertical section through a mixing drum disclosing an embodiment ofthe invention. Fig. 2 is a section through Fig. 1 on line 2 2.

Referring to the accompanying drawings by numerals 1 indicates a drum which may be of any suitable kind having openings 2 and 3, opening 2 being adapted to receive the material to be mixed and opening 3 accommodating the discharge chute fl which is pivotally supported in any suitable manner and arranged to project into the drum. When the chute 4: is moved downward to the position shown in Fig. 1 it is in the discharge position, whereas if it is moved until it is in the opposite position the material in the drum will be turned from side to side and thoroughly mixed as it is worked back and forth. The drum may be driven by a suitable sprocket wheel 5 engaging the chain or other driving means, the particular means for rotating the drum forming no part of the present invention.

Arranged interiorly of the drum are a plurality of members 6 of identical construction and spaced apart proper distances for producing the best results. In arranging the members 6 they extend from each side of the drum toward the center and are-staggered, as shown more clearly in Fig. 1, so that the mass of material in the drum may be worked back and forth and thrown from side to side, whereby the device will not only mix concrete but will allow the use of lime and mortar. Each of the members 6 is provided with a guiding side web 7 merging into a central bucket 8. The buckets 8 are preferably inclined from a radial line, as shown in Fig. 2, the entire construction of members 6 not reaching a point opposite the openings 2 and 3. This allows the free insertion of members t and 9.

It will be noted that all of the members 6 are identical in construction but the opposite members are. reversely arranged and may be secured in place by any desired means, as for instance, angle irons 10 held in place by rivets, bolts or the like, these angle irons being of course on the back of the buckets and also the webs 7 The webs 7 extend from the sides so as to guide the material, or, rather, to throw the material from one side to the other as the drum rotates. The mass of concrete aggregate in the drum maintains a general central position during the rotation of the drum but sways from side to side as it' is stirred or moved by members 6. When the discharge chute 4t is moved to the discharge position, as shown in dotted lines in Fig. 1, the buckets 8 begin to discharge therein and discharge successively as they reach the proper elevation.

In this connection it is noted that all of the f buckets discharge as well as assist in mixing.

What I claim is:

A concrete mixing machine, comprising a drum provided with side walls, one of which is formed with an aperture centrally thereof, and a plurality of blades extending from the side walls, the blades on one side being spaced from the blades on the other and also being arrangedl alternately, saidblades terminating substantially centrally in a curved portion acting as buckets, said buckname to this specification in the presence of ets being connected to the periphery of the two subscribing Witnesses.

drum Whereb the blades act not onl as means for Woiking the material back yand OBERT G' MANDT' 5 forth but act as discharge buckets at the cen- Witnesses:

trai portion. MILDRED SGHIEBEL, In testimony whereof I have signed my LEONORE WEBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

